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Subjectarch/powerpc/mm/mem.c:53:12: error: no previous prototype for function 'create_section_mapping'
Hi Christophe,

FYI, the error/warning still remains.

tree: master
head: 007b350a58754a93ca9fe50c498cc27780171153
commit: b26e8f27253a47bff90972b987112fd8396e9b8d powerpc/mem: Move cache flushing functions into mm/cacheflush.c
date: 3 months ago
config: powerpc64-randconfig-r005-20210628 (attached as .config)
compiler: clang version 13.0.0 ( 8d21d5472501460933e78aead04cf59579025ba4)
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc64 cross compiling tool for clang build
# apt-get install binutils-powerpc64-linux-gnu
git remote add linus
git fetch --no-tags linus master
git checkout b26e8f27253a47bff90972b987112fd8396e9b8d
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <>

All errors (new ones prefixed by >>):

In file included from arch/powerpc/mm/mem.c:15:
In file included from include/linux/memblock.h:13:
In file included from include/linux/mm.h:9:
In file included from include/linux/mmdebug.h:5:
In file included from include/linux/bug.h:5:
In file included from arch/powerpc/include/asm/bug.h:109:
In file included from include/asm-generic/bug.h:20:
In file included from include/linux/kernel.h:11:
In file included from include/linux/bitops.h:32:
In file included from arch/powerpc/include/asm/bitops.h:62:
arch/powerpc/include/asm/barrier.h:49:9: error: '__lwsync' macro redefined [-Werror,-Wmacro-redefined]
#define __lwsync() __asm__ __volatile__ (stringify_in_c(LWSYNC) : : :"memory")
<built-in>:310:9: note: previous definition is here
#define __lwsync __builtin_ppc_lwsync
>> arch/powerpc/mm/mem.c:53:12: error: no previous prototype for function 'create_section_mapping' [-Werror,-Wmissing-prototypes]
int __weak create_section_mapping(unsigned long start, unsigned long end,
arch/powerpc/mm/mem.c:53:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int __weak create_section_mapping(unsigned long start, unsigned long end,
2 errors generated.

vim +/create_section_mapping +53 arch/powerpc/mm/mem.c

bc02af93dd2bbd Yasunori Goto 2006-06-27 52
4e00c5affdd4b0 Logan Gunthorpe 2020-04-10 @53 int __weak create_section_mapping(unsigned long start, unsigned long end,
4e00c5affdd4b0 Logan Gunthorpe 2020-04-10 54 int nid, pgprot_t prot)
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 55 {
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 56 return -ENODEV;
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 57 }
fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 58

:::::: The code at line 53 was first introduced by commit
:::::: 4e00c5affdd4b04e6392001716333971932f3d0c powerpc/mm: thread pgprot_t through create_section_mapping()

:::::: TO: Logan Gunthorpe <>
:::::: CC: Linus Torvalds <>

0-DAY CI Kernel Test Service, Intel Corporation
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